IMHO, cooler air is denser, thus contains more oxygen by volume. Humidity decreases O2 content by volume. cool air more potential , wet air less. But when you combine the two, cool and damp air it likely is a net increase.
And, it is confusing as cool night air always feels damp to human skin. But, that may not be really true. Think of it this way, there is usually no weather change effecting humidity coincident with sundown. Just feels that way.
water injection works because it is introduced after the air and fuel is mixed. It work in different ways in different engines. It allows more timing advance on supercharged or turbocharged engines. It was used on early jets to lower power turbine temps and increase thrust through the increased mass of exhaust gases. Anybody remember early b47/b52 or even b707s on takeoff and that huge plume of black?
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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